scholarly journals Achene micromorphology and its taxonomic significance in some species in Taraxacum sect. Palustria (Asteraceae)

PhytoKeys ◽  
2020 ◽  
Vol 166 ◽  
pp. 1-28
Author(s):  
Agnieszka Rewicz ◽  
Jolanta Marciniuk ◽  
Paweł Marciniuk
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Diagnostic Value ◽  
Species Level ◽  
Taxonomic Significance ◽  
Rational Use ◽  
Number Of Species ◽  
Dichotomous Key ◽  
As Species ◽  
Scanning Electron

The genus Taraxacum is one of the largest and taxonomically most complicated apomictic genera. Currently, it is considered to consist of over 2800 species placed within 60 sections. Due to the large number of species, and their uniform morphological design and plasticity of leaves, the identification of plants at the species level is challenging even for specialists. This problem significantly hinders the study of their properties and the rational use of these valuable medicinal and nutritional plants. This paper presents the results of research on the morphology and micromorphology of achenes of 28 Taraxacum species of sect. Palustria and for comparison one species per section of: Erythrosperma, Naevosa, Piesis, and Taraxacum. The achenes were measured with a stereoscopic microscope and a biometric program, and micromorphological studies were performed by scanning electron microscopy. It has been shown that traits associated with achene morphology and micromorphology have a high diagnostic value, allowing us to distinguish sections as well as species within the sect. Palustria. Based on the examined achene features, a dichotomous key for determining the studied species was constructed.

Pollen Morphology and Taxonomic Significance of Chinese Morus L.

2014 ◽  
Vol 618 ◽  
pp. 344-348
Author(s):  
Ling Liu ◽  
Xi Tong Shen ◽  
Xiang Ping Chen ◽  
Xiao Min Fan ◽  
Ren Fang Chen
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Pollen Morphology ◽  
Species Level ◽  
Morus Alba ◽  
Pollen Size ◽  
Aperture Size ◽  
Taxonomic Significance ◽  
Initial Forms ◽  
Scanning Electron

Study the Chinese Morus from the aspect of pollen morphology of 25 Chinese Morus plants of 10 species and 1 variety were observed using scanning electron microscopy (SEM). Results showed the differences to be mainly in pollen size, aperture size, P/E value and columellae structure.Supported the conclusion thatMorus bombycisis a species level unit butMorus mizuho,Morus atropurpurea, andMorus multicaulisare not, the conclusion thatMorus atropurpurea,Morus multicaulis, Morus alba, andMorus macrouraare initial forms, and thatMorus mongolica, Morus mongolicavar. diabolica, Morus bombycis, andMorus australisare later forms.

scholarly journals First definitive record of a whip scorpion Labochirus tauricornis (Pocock, 1900) from Goa, India: with notes on its morphometry and pedipalp micro-morphology

2018 ◽  
Vol 10 (7) ◽  
pp. 11955
Author(s):  
Manoj Ramakant Borkar
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Sexual Dimorphism ◽  
Diagnostic Value ◽  
The State ◽  
Diagnostic Data ◽  
Micro Morphology ◽  
Scanning Electron

Bastawade & Borkar in 2008 made a passing reference to the presence of a single uropygid species in Goa, though without much primary diagnostic data on the collected specimen of four females.  The present study puts in place a definitive record of the uropygid, Labochirus tauricornis Pocock, (1900) in the state of Goa, and addresses an important gap in our understanding of its occurrence, morphology, and ecology. Besides documenting the species of this cryptozoic, nocturnal arachnid predator commonly known as ‘Vinegaroon’ on account of their vinegary allomone spray; the present study also describes the gross morphology , morphometry and micro-morphology of non-ambulatory sub-raptorial pedipalps which are of taxonomic-diagnostic value, elucidated using scanning electron microscopy, in addition to routine stereomicroscopy. The paper also examines in detail, sexual dimorphism and morphometry of this uropygid species. 

Taxonomically Important Features on the Surface of Floatoblasts in Plumatella (Bryozoa)

2000 ◽  
Vol 6 (3) ◽  
pp. 202-210
Author(s):  
Kevin T. Reynolds
Keyword(s):  
Electron Microscopy ◽  
United States ◽  
Scanning Electron Microscopy ◽  
Suture Line ◽  
Species Level ◽  
Surface Features ◽  
The Family ◽  
Group A ◽  
Distinguishing Features ◽  
Scanning Electron

Abstract At the species level, bryozoans (class Phylactolaemata) in the family Plumatellidae are difficult to organize taxonomically. Of principal concern is the absence of consistent distinguishing features due mainly to plasticity of the group, a common problem with soft-bodied invertebrates. Yet, within the last three decades, analysis of distinctive chitinous statoblasts—using scanning electron microscopy—has resolved certain taxonomic questions. I examined statoblasts from 30 similar collections, the majority from the midwestern United States, and identified four distinct subgroups. Also, nine new statoblast surface features were identified: fold, polar grooves, bead, cave, demarcation, parasutural zone, ridge, sutural band, and sutural knob. The surface features of floating statoblasts (floatoblasts) provide useful data for species identification. Most consistently useful in plumatellids is a suture which varies from one species to the next. Mound-like tubercles and net-like ridges are next in the extent of variability. Finally, folds and polar grooves are present but vary even within floatoblasts from the same colony. Analysis of the suture in Plumatella fungosa, over a 5-day germination period, reveals all features at the site remain intact regardless of the initial age of the floatoblast. Only the suture line itself splits lengthwise to permit emergence of the new animal.

The identification and taxonomic significance of lophate pollen in the Compositae

1986 ◽  
Vol 64 (12) ◽  
pp. 3101-3112 ◽  
Author(s):  
Stephen Blackmore
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Convergent Evolution ◽  
Full Potential ◽  
Taxonomic Significance ◽  
Widespread Occurrence ◽  
Functional Aspects ◽  
Scanning Electron

Lophate pollen occurs in many members of tribes Arctoteae, Lactuceae, Mutisieae, and Vernonieae of the Compositae. Fifteen distinct patterns of echinolophate pollen and eight of psilolophate pollen are described and illustrated by scanning electron microscopy. A key is provided that enables the 23 patterns to be recognised. The full potential of lophate pollen as a source of taxonomic characters can only be achieved when the pattern of lophae present has been determined. The simple distinction between lophate and nonlophate pollen is rarely informative. The widespread occurrence of lophate pollen is attributed to convergent evolution and related to functional aspects of the pollen.

scholarly journals Taxonomic significance of pollen morphology in Succisa and Succisella

2019 ◽  
Vol 55 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Zoya M. Tsymbalyuk ◽  
Sergei L. Mosyakin ◽  
Lyudmila M. Nitsenko
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Pollen Morphology ◽  
Pollen Grains ◽  
Polar View ◽  
Taxonomic Significance ◽  
Oblate Spheroidal ◽  
Phylogenetic Studies ◽  
Molecular Phylogenetic ◽  
Scanning Electron

Abstract Pollen morphology of representatives of the genera Succisa and Succisella in the flora of Ukraine was studied using light and scanning electron microscopy. Pollen grains in both taxa were tricolpate, prolate, rarely oblate-spheroidal or spheroidal; large-sized. Their outline in polar view was subcircular, rarely trilobate, in equatorial view elliptical or rarely circular. Colpi short, of variable width, margins irregular with distinct, narrow margo, and blunt or acute ends. Exine sculpture was echinate-microechinate. The revealed characteristics of pollen grains are taxonomically significant at the generic and specific levels, and they can be used in pollen analysis. Palynomorphological data are consistent with the results of recent molecular phylogenetic studies. Data on pollen morphology also confirm taxonomic circumscription of Succiseae V. Mayer & Ehrend. Pollen grains in Succiseae are characterized by a tricolpate aperture type, which was probably ancestral in Dipsacaceae s. str.

Taxonomic significance of cypsela morphology in tribe Cichoreae (Asteraceae) using light microscopy and scanning electron microscopy

2019 ◽  
Vol 83 (3) ◽  
pp. 239-248 ◽  
Author(s):  
Sana Ayaz ◽  
Mushtaq Ahmad ◽  
Muhammad Zafar ◽  
Muhammad I. Ali ◽  
Shazia Sultana ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Light Microscopy ◽  
Taxonomic Significance ◽  
Scanning Electron

scholarly journals Nutlet morphology and its taxonomic significance in the genus Mentha L. (Lamiaceae) from Turkey

2013 ◽  
Vol 20 (1) ◽  
pp. 9-18 ◽  
Author(s):  
Gül Tarimcilar ◽  
Özer Yilmaz ◽  
Ruziye Daskin ◽  
Gönül Kaynak
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Morphological Characteristics ◽  
Taxonomic Significance ◽  
Diagnostic Characteristics ◽  
Scanning Electron

The nutlet morphology of 11 taxa of Mentha L. (M. pulegium, M. aquatica, M. × piperita, M. x dumetorum, M. spicata subsp. spicata, M. spicata subsp. tomentosa, M. × villoso-nervata, M. longifolia subsp. longifolia, M. longifolia subsp. typhoides, M. × rotundifolia and M. suaveolens) distributed throughout Turkey was investigated by scanning electron microscopy (SEM). The shape of all studied nutlets was broadly oblong or ovoid. Nutlet size ranged from 0.54 to 0.97 mm in length and from 0.37 to 0.66 mm in width. The smallest and biggest nutlets were found in M. × villoso-nervata and M. aquatica, respectively. The Mentha taxa studied can be divided into three groups, based on nut sculpturing type such as distinctly bireticulate, inconspicuously bireticulate and reticulate. This study has shown that some nutlet morphological characteristics can be utilised as additional diagnostic characteristics in delimitations of Mentha at the species and infraspecific levels.  

Pollen morphology of Lagotis (Scrophulariaceae)

1995 ◽  
Vol 73 (5) ◽  
pp. 701-709 ◽  
Author(s):  
Charles L. Argue
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Light Microscopy ◽  
Key Words ◽  
Pollen Morphology ◽  
Pollen Grains ◽  
As Species ◽  
Close Relationship ◽  
Scanning Electron

The pollen grains of 18 species of Lagotis have been examined using light microscopy and scanning electron microscopy of whole and fractured pollen. The grains are characterized by tricolporate apertures with smooth to sparsely granular ectocolpus membranes; lolongate endoapertures with unthickened margins included within the ectocolpi; relatively large exinous processes over the endoaperture; and columellate, semitectate, reticulate to microreticulate exines with or without supramurial processes. Lumina are reduced in size toward the colpus, but the transition is gradual, and a sharply bounded, differentially sculptured colpus border is absent. Lagotis pollen is distinct from that of the Selagineae and Globularia and indistinct from that of some Veroniceae; however, the characters shared with the latter are of wide occurrence in the Scrophulariaceae. Pollen morphology supports the distinction between L. brachystachya and L. stolonifera. It is consistent with the postulated close relationship between L. micrantha and L. integra, and provides no evidence to support the reestablishment of L. cashmeriana, L. minor, L. pallasii, or L. kunawurensis as species distinct from L. glauca. Key words: pollen morphology, Lagotis, Globularia, Selagineae, Veroniceae.

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